John f



Patented June 2, 1857.

UNITED STATES PATENT OFFICE.

JOHN F. SCHARER, OF NEW YORK, N. Y.

DIE-STOCK.

Specification of Letters Patent No. 17,453, dated June 2, 1857.

To all whom it may concern:

Be it known that I, JOHN F. SOHARER, of New York, in the county and State of New York, have invented a new and Improved Arrangement of Stocks and Dies for Cutting Bolts and Screws; and I do hereby declare that the following is a full and exact description thereof, reference being had to the accompanying drawings and to the let-- ters of reference marked thereon.

The nature of my invention consists in the arrangements of dies of difierent and graduated sizes around the periphery of circular plates and fitted into the stock in such a manner that while one half of the die is held stationary the other half, although pressed against the bolt or screw to be out, is capable of adjusting itself, so as to insure a perfect thread on the same.

In the accompanying drawing A represents the stock into which are fitted the circular plates B and D, having on their periphery the dies a, Z), 0, cl, f, g. h, and a, b, c, d, f, g, h cut on, and likewise the plate C. The whole being covered up by a plate with an opening similar to the bottom plate, as shown in dotted lines.

The plate B has on its circumference recesses n, n, into which the set-screw E fits, which when screwed up, holds the same perfectly steady and in a position to have one of the dies in the center of the stock. The other circular plate D is pressed up against the bolt by the smooth plate, C, acted upon by the screw I, but on account of the smoothness of said plate as well as of the periphery of the circular die plate D this said die plate is capable of a slight motion so as to regulate itself.

39 and p are holes in the center of the die plates provided with small notches to turn the plates by.

I am aware that circular plates having dies or recesses of graduated different sizes 

